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An equipment bonding jumper shall be used to connect the grounding terminal of a grounding-type receptacle to a grounded box.
EXCEPTION: No. 1: Where the box is surface-mounted, direct metal-to-metal contact between the device yoke and the box shall be permitted to ground the receptacle to the box. This Exception shall not apply to cover-mounted receptacles unless the box and cover combination are listed as providing satisfactory ground continuity between the box and the receptacle.
EXCEPTION: No. 2: Contact devices or yokes designed and listed for the purpose shall be permitted in conjunction with the supporting screws to establish the grounding circuit between the device yoke and flush-type boxes.
EXCEPTION: No. 3: Floor boxes designed for and listed as providing satisfactory ground continuity between the box and the device.
EXCEPTION: No. 4: Where required for the reduction of electrical noise (electromagnetic interference) on the grounding circuit, a receptacle in which the grounding terminal is purposely insulated from the receptacle mounting means shall be permitted. The receptacle grounding terminal shall be grounded by an insulated equipment grounding conductor run with the circuit conductors. This grounding conductor shall be permitted to pass through one or more panelboards without connection to the panelboard grounding terminal so as to terminate directly at and equipment grounding conductor terminal of the applicable derived system or service.
(Title 24, Part 3, Section 250-74.)
NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
1. Editorial correction to add Exception No. 4 which was erroneously deleted in Register 79, No. 12 (Register 79, No. 15).
2. Editorial correction filed 11-2-83 (Register 83, No. 45).
3. Amendment filed 8-27-86; effective thirtieth day thereafter (Register 86, No. 37).